Fig. 1From: Method development for the quantitative determination of short chain fatty acids in microbial samples by solid phase extraction and gas chromatography with flame ionization detectionTotal ion chromatograms of the microbial sample spiked with SCFAs in the GC-MS scan mode (A) underivatized extract (a) Mass spectrum of partially separated butyric acid (50 μg/mL), (B) after TBDMS derivatization. (b) Mass spectrum of propionic acid-TBDMS eluted after the artifactBack to article page